Feeding mechanism for sewing-machines.



E. T. ALLAN.

FEEDING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED DEC. 15. $911. 1,21 1,808. Patented Jan. 9,1917.

3 SHEETS-S EE E T. ALLAN. FEEDING MECHANISM FOR SEWING MACHINES. APPLICATION FlLED DEC-15,1911.

Patented Jan. 9,1917.

3 SHEETSSHEET 2.

WMmmm 7Z M 351, WVMM E. T. ALLAN. FEEDING MECHANISM FOR SEWING MACHINES. 7

APPLICATION nuzo DEC. 15. 1911. 1 21 1 803 Patented Jan. 9, 1917.

a SHEETS-SHEET 3.

" ED STATES, PATENT OFFICE.

EDWARD '1. ALLAN, OF CINCINNATI, OHIO, ASSIGNOR. TO UNION SPECIAL MACHINE COMPAN Y1, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

FEEDING MECHANISM FOR SEWIN G-MACHIN ES.

Application filed December 15, 1911.

To all whom it may concern Be it known that I, EDWARD T. ALLAN, a citizen of the United States, residing at Cincinnati, in the county of Hamilton, State of Ohio, have invented certain new and useful Improvements in Feeding Mechanisms for Sewing-Machines, of which the following is a description, reference being had to the accompanying drawing and to the letters and figures of reference marked thereon. Y

The invention relates to new and useful improvements in feeding mechanisms for sewing machines, and more especially to feeding mechanisms which include a lower feed dog and an upper feed dog between which the material is gripped and fed to the stitching mechanism.

An object of the invention is to provide an upper feed dog construction wherein the feed dog is carried into gripping engagement with the material as it is moved longitudinally to feed the material, and through the aid of the mechanism which reciprocates the upper feed mechanism back and forth.

A further object of the invention is to provide a device for engaging and moving the upper feed dog into gripping contact with the material, which device is so constructed as to offer comparatively little resistance to the movements of the feed dog.

A still further object of the invention is to provide devices for moving the upper feed dog into contact with the material, which devices are adjustable, so that the grip of the material by the feed dog may be varied.

These and other objects will in part be obvious, and will in part be hereinafter more fully described. g

In the drawings which show by way of illustration one embodiment of the invention', Fi-gure l is an end view partly in section, and partly broken away, of a sewing machine having the, improvements applied thereto. Fig.2 is a rear view of the same; Fig. 3 is a detail showing the feed dogs in side elevation, and as viewed from beneath the arm of the machine. Fig. 4: is a detail view showing the upper feed dog, and the roller for depressing the same, with the feed dog at the forward end of its stroke. 7 Fig. 5 is a similar view, with the feed dogat the rear end of its stroke. Fig. 6-isa detail,

Specification of Letters Patent.

Patented J an. 9, 1917. Serial 0. 665,928.

showing the relative position of the needles, the presser foot, the upper feed dog, and the fabric guides. Fig. 7 is a plan view of the same. Fig. 8 is adetail showing the throat plate, the feed dog therein, and the fabric guide infront of the throat plate.

The sewing machine as herein shown, is provided with the usual work support 1, and an overhanging arm 2 in which reciprocates a needle bar3 carrying needles 4, 4. A presser bar 5 is mounted in the forward end of the overhanging arm, and carries a presser foot 6. pressed by the usual spring raised either by the foot lever 8, or hand lever 9. Cooperating with the needles is any desired complemental stitch forming mechamsm.

The material is fed to the stitching mechanism by. a feeding mechanism, consisting of a lower feed dog 10, and an upper feed dog 11. The lower feed dog 10 is carried by a feed bar 12, which ispivoted to the usual feed rocker 13. lates, the lower feed dog is moved back and forth. Thelower feed dog is raised and 7 and may be lowered by an eccentric 14, carried by the main shaft 15.

The upper feed dog 11 in the present embodiment of the invention, extends along one side of the presser foot 6. This feed dog is carried by a shank 16, which is pivoted at 17 to an arm 18, carried by a rock shaft 19 mounted in suitable bearings 20 and 21, carried'by the overhanging arm. The rock shaft 19 carries a second arm 22, which is rigid therewith. This arm 22 can rise a ball stud at its lower end, which is engaged by the outer end of an eccentric strap 23, cooperating with an eccentric mounted on a disk 24- carried by the main shaft 15. As the main shaft rotates the arm 22 will be oscillated, which through the arm 18,

The presser bar is held de- As the feed rocker oscilwill move the upperfeed dog 11 back and below the upper a bolt 26, having an eccentric portion 27 on which is mounted a roller 28. The head 29 of the bolt 26, is slightly larger than said roller 28. The upper feed dog is substantially the same width as the roller, and said roller engages the upper face of said feed dog. The head 29 of the bolt extends surface of the feed dog, and forms a guiding wall for said feed dog. The side of the presser foot forms a guiding wall for the other side of the upper feed dog. The shank 16 of the upper feed dog is provided with an eye 80, which engages one end of a coil spring 31. The other endof the spring engages an eye 32 carried by the arm 18. This spring tends to raise the upper feed dog and hold the same in contact with the roller carried by the presser foot. The upper face of the feed dog 11, is provided with a cam-shaped projection 83, which is adapted to be engaged by the roller 28, when the feed dog is reciprocated. This cam projection is so disposed relative to the roller as to be in advance of the roller when the feed dog is at the forward end of its stroke. As the feed dog is moved longitudinally, the cam projection engages the roller, which will crowd the feed dog downward into positive gripping contact with the material. The lower feed dog extends underneath the upper feed dog, as well as the presser foot, and as said lower dog is raised, the material will be gripped against the under face of the presser foot, and against the under face of the upper feed dog, and the material thereby carried along a stitch length. The upper feed dog is serrated on its lower face in the usual manner. On the return of the feed dogs, the cam projection on the upper feed dog, will be moved away from the roller, and through the action of the spring 31, will be slightly raised, as said dog moves forward.

The bolt 26 which supports the roller 28, is formed with an eccentric portion, and therefore, by adjusting the bolt, the position of the roller relative to the lower surface of the presser foot, may be varied, and thereby the gripping contact of the upper feed dog on the material, may be varied.

It will be noted that while I have provided means for positively causing the upper feed dog to grip the material and feed the same, that said means in the present embodiment of the invention, is carried by the presser foot, and can therefore, yield with the presser foot, for varying thicknesses of the material.

One of the purposes for which my invention is especially adapted, is the stitching of the lining to the upper of a shoe. In order to assist-in guiding the upper to the stitching mechanism, I have provided an edge guide 34-. The edge guide 8 L extends along side of the presser foot. Said edge guide is carried by a spring shank screwed to the upper face of the presser foot.

second edge guide 36 is carried by the work support 1, and is located of the presser foot. Said edge guide 36 is formed with an overhanging part which serves as a rest for the upper being stitched. The lining is guided underneath the overhanging part 37, by the guide 86, to the stitching mechanism.

It is obvious that minor changes in the details of construction and arrangements of parts may be made, without departing from the spirit of my invention as set forth in the appended claims.

Having thus particularly described my invention, what I claim as new and desire to secure by Letters Patent, is 1. The combination of a work support, a presser foot, and a feeding mechanism including a feed dog located above said work support, means for reciprocating the feed dog back and forth, and cooperating means carried by the presser foot and feed dog for increasing the gripping pressure of the feed dog on the material during its backward reciprocation.

2. The combination of a work support, a presser foot, and a feeding mechanism including a feed dog located above said work support, means for reciprocating said feed dog back and forth, a spring for normally lifting the feed dog from the material, said presser foot having means to limit the upward movement of the feed dog, and means carried by the feed dog and cooperating with said limiting means for increasing the grip of the feed dog on the material during its backward stroke.

3. A feeding mechanism including in combination, a work support, a feed dog located above said work support, means for reciprocating the feed dog back and forth, and

means operated by the reciprocation of the feed dog for moving the same into gripping" contact with the material, said last named means including a cam-projection, a roller engaging the cam projection, and means for adjusting the roller to vary the gripping contact of the feed dog.

4:. A sewing machine including in combination, a work support, a feed dog located above said work support, means for reciprocating the feed dog, a roller engaging the upper face of the feed dog, and an adjustable eccentric stud for supporting said roller.

5. The combination of a presser foot, a work support and a feeding mechanism, including an upper feed dog having a cam projection with means for reciprocating said upper feed dog and a roller carried by the presserfoot and adapted to engage said cam projection for forcing the feed dog into directly in front and is properly directed gripping contact with the material during the reciprocation of the upper feed dog.

6. The combination of a presser foot, a work support and a feeding mechanism, including an upper feed dog having a cam projection and means for reciprocating said upper feed dog, a roller carried by the presser foot and adapted to engage said cam projection for forcing the feed dog into gripping contact with the material during its reciprocation in one direction, and a spring for holding said feed dog in contact with said roller.

7. The combination of a presser foot, a Work support and a feeding mechanism in-. cluding an upper feed dog located at one side of the presser foot, a roller carried by the presser foot and engaging the upper face of ,the feed dog, a cam projection on the feed dog adapted to engage said roller whereby the feed dog is forced against the material, and a spring for holding feed dog in contact with the roller.

S. The combination of a presser foot, a

work support, and a feeding mechanism including an upper feed dog located at one side of said presser foot, a bolt carried by the presser foot and having an eccentric portion, a roller mounted on said eccentric por- Copies of this patent may be obtained for five cents each, by addressing the tion, and engaging the upper face of the feed dog, a spring for holding the feed dog in contact with said roller, said feed dog having a cam projection adapted to engage said roller, and means for reciprocating said feed dog.

9. The combination of a presser foot, an upper feed dog located at one side of the presser foot, a lower feed dog extending beneath the presser foot and upper feed dog, a roller carried by the presser foot and engaging the upper feed dog, an edge guide carried by the presser foot for guiding amaterial between the upper and lower feed dogs, a second edge guide carried by the work support for guiding a material between the presser foot and lower feed dog only, and means carried by the feed dog and cooperating with said roller whereby said feed dog as it is reciprocated to feed the material is crowded into gripping engagement therewith.

In testimony whereof I afix my signature, in presence of two witnesses.

EDWARD T. ALLAN.

Witnesses:

I. M. SHUMARD, ROY ELKIN.

"Commissioner of Patents,

Washington, D. 0. 

